<mods:titleid="7CAE6DF09E0A9CA54FA6B03E44D3F87C">Systematic revision of the snorkel snail genus Rhiostoma Benson, 1860 (Gastropoda, Caenogastropoda, Cyclophoridae) with descriptions of new species</mods:title>
<mods:affiliationid="715E42CF056D856370588EE7C1D745F2">Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand</mods:affiliation>
<mods:affiliationid="1A0925C8FAEFD93D81CEC704D9E9628A">Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand & Present address: Department of Biology, Faculty of Science, Mahasarakham University, Kantharawichai, Maha Sarakham 44150 Thailand</mods:affiliation>
<mods:affiliationid="0EEEF5941FAD973B8D4AB4D2F63F33F1">Department of Biology, Faculty of Natural Science, National University of Laos, P. O. Box 7322, Dongdok, Vientiane, Laos</mods:affiliation>
<mods:affiliationid="5195E4478B378C2B112634B5C9168AB0">School of Biology, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand</mods:affiliation>
<mods:affiliationid="C4F8D2BCBED38CC44890732D4C43142D">Animal Systematics and Molecular Ecology Laboratory, Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand</mods:affiliation>
<mods:affiliationid="21AA8CF3A6E42E6338C735DFD41474BA">Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand</mods:affiliation>
<mods:affiliationid="7122A5509E5021AADFB448EFBC30673E">Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand</mods:affiliation>
<taxonomicNameid="BB0B7736A9932E6763D46BAC705620C1"ID-CoL="B3CKH"LSID="2CB2612F-1288-5FC0-BB61-101462F92B7F"authority="(Thach & Huber, 2020)"baseAuthorityName="Thach & Huber"baseAuthorityYear="2020"class="Gastropoda"family="Cyclophoridae"genus="Opisthoporus"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Opisthoporus battambangensis"order="Architaenioglossa"pageId="0"pageNumber="1"phylum="Mollusca"rank="species"species="battambangensis">Opisthoporus battambangensis (Thach & Huber, 2020)</taxonomicName>
<figureCitationid="149082C15855F03EDB5DA8A59E01E95A"captionStart="Figure 57"captionStartId="F57"captionText="Figure 57. A Pterocyclos subalatus Sykes, 1903, holotype UMZC 1032 from Gunong Inas, Perak, Malay Peninsula B Pterocyclos spelaeotes (Tomlin, 1931), lectotype NMW 1955.158.01107 from Batu Cave, Kula Lumpur, Selangor C Pterocyclos umbraticus (Benthem Jutting, 1949), holotype ZMA 135622 from Maxwell's Hill, Perak, Malaysia D Cyclotus boxalli syntype NHMUK 1894.5.23.1 from Kina Balu E Opisthoporus battambangensis holotype MNHN-IM- 2000 - 35506 from Battambang, Cambodia F Opisthoporus grohi holotype MNHN-IM- 2000 - 35507 from Dak Nong, Vietnam. Photograph: H Wood, NMW (B), M Caballer, A Lardeur and V Heros, MNHN (E, F)."figureDoi="10.3897/zookeys.1142.90097.figure57"httpUri="https://binary.pensoft.net/fig/799915"pageId="0"pageNumber="1">Fig. 57E</figureCitation>
<taxonomicNameid="990853FCC7870D6391B8673A65A701E8"authorityName="Thach & F. Huber"authorityYear="2020"class="Gastropoda"family="Cyclophoridae"genus="Rhiostoma"higherTaxonomySource="treatment-meta"kingdom="Animalia"lsidName="Rhiostoma battambangensis"order="Architaenioglossa"pageId="0"pageNumber="1"phylum="Mollusca"rank="species"species="battambangensis">Rhiostoma battambangensis</taxonomicName>
<figureCitationid="71BF6217E4D182D0DE4C8900D96270D1"captionStart="Figure 57"captionStartId="F57"captionText="Figure 57. A Pterocyclos subalatus Sykes, 1903, holotype UMZC 1032 from Gunong Inas, Perak, Malay Peninsula B Pterocyclos spelaeotes (Tomlin, 1931), lectotype NMW 1955.158.01107 from Batu Cave, Kula Lumpur, Selangor C Pterocyclos umbraticus (Benthem Jutting, 1949), holotype ZMA 135622 from Maxwell's Hill, Perak, Malaysia D Cyclotus boxalli syntype NHMUK 1894.5.23.1 from Kina Balu E Opisthoporus battambangensis holotype MNHN-IM- 2000 - 35506 from Battambang, Cambodia F Opisthoporus grohi holotype MNHN-IM- 2000 - 35507 from Dak Nong, Vietnam. Photograph: H Wood, NMW (B), M Caballer, A Lardeur and V Heros, MNHN (E, F)."figureDoi="10.3897/zookeys.1142.90097.figure57"httpUri="https://binary.pensoft.net/fig/799915"pageId="0"pageNumber="1">57E</figureCitation>
collections. The operculum is attached with the holotype and has a calcareous, multispiral, and plate-shaped operculum; the shell has a short detached whorl and yellowish brown periostracum. The outer peristome is slightly expanded with short tubular breathing device located on the suture area of the detached whorl, and the inner peristome has a shallow incision. These are the distinguishing characters of
<taxonomicNameid="A0501432D3673C9DCFAF5BAA8FAC2686"authorityName="Benson in Pfeiffer"authorityYear="1851"class="Gastropoda"family="Cyclophoridae"genus="Opisthoporus"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Opisthoporus"order="Architaenioglossa"pageId="0"pageNumber="1"phylum="Mollusca"rank="genus">
<taxonomicNameid="1B234E10673952D8A317EBDCA9E4F4D1"authorityName="Benson in Pfeiffer"authorityYear="1851"class="Gastropoda"family="Cyclophoridae"genus="Opisthoporus"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Opisthoporus"order="Architaenioglossa"pageId="0"pageNumber="1"phylum="Mollusca"rank="genus">